Wordnet 3.0
NOUN (1)
1. 
 Indian religious leader who founded Sikhism in dissent from the caste system of Hinduism; 
 he taught that all men had a right to search for knowledge of God and that spiritual liberation could be attained by meditating on the name of God (1469-1538); 
[syn: Nanak, Guru Nanak]
WordNet (r) 3.0 (2006):
Nanak
    n 1: Indian religious leader who founded Sikhism in dissent from
         the caste system of Hinduism; he taught that all men had a
         right to search for knowledge of God and that spiritual
         liberation could be attained by meditating on the name of
         God (1469-1538) [syn: Nanak, Guru Nanak]